Extended Description

With clang/libc++/libc++abi 3.9.0 (trunk 268575), I am no longer to build webkitgtk on Linux. It appears that some recent changes to the tuple header made this happen.

The code still compiles with clang/libc++/libc++abi 3.8.0 and gcc 6.1.0.

See also: https://bugs.webkit.org/show_bug.cgi?id=157382

In file included from :1:
In file included from /sources/webkitgtk-2.12.2/Source/WebKit2/WebKit2Prefix.h:69:
In file included from /usr/bin/../include/c++/v1/algorithm:631:
/usr/bin/../include/c++/v1/type_traits:1331:59: error: incomplete type 'WebCore::IDBRequestData' used in type trait expression
: public integral_constant<bool, __is_base_of(_Bp, _Dp)> {};
^
/usr/bin/../include/c++/v1/type_traits:543:37: note: in instantiation of template class 'std::__1::is_base_of<std::__1::allocator_arg_t, WebCore::IDBRequestData>' requested
here
struct __lazy_and : __lazy_and_impl<_P1::type::value, _Pr...> {};
^
/usr/bin/../include/c++/v1/tuple:664:9: note: in instantiation of template class 'std::__1::__lazy_and<std::__1::is_base_of<std::__1::allocator_arg_t, WebCore::IDBRequestData>,
std::__1::__lazy_all<std::__1::__dependent_type<std::__1::is_default_constructible<const WebCore::IDBRequestData &>, true>,
std::__1::__dependent_type<std::__1::is_default_constructible<const WebCore::IDBObjectStoreInfo &>, true> > >' requested here
__lazy_and<
^
/usr/bin/../include/c++/v1/tuple:670:5: note: in instantiation of default argument for 'tuple<WebCore::IDBRequestData, WebCore::IDBObjectStoreInfo, true>' required here
tuple(_AllocArgT, _Alloc const& __a)
^~~~~
/sources/webkitgtk-build/DerivedSources/WebKit2/WebIDBConnectionToClientMessages.h:180:11: note: while substituting deduced template arguments into function template 'tuple'
[with _AllocArgT = WebCore::IDBRequestData, _Alloc = WebCore::IDBObjectStoreInfo, _Dummy = (no value), $3 = (no value)]
: m_arguments(requestData, info)
^
/sources/webkitgtk-2.12.2/Source/WebKit2/DatabaseProcess/IndexedDB/WebIDBConnectionToClient.h:40:7: note: forward declaration of 'WebCore::IDBRequestData'
class IDBRequestData;